Presentation Information

[25p-71B-11]Enhancement of double-exchange interaction in a La2/3Sr1/3MnO3 membrane released from epitaxial strain

〇Takahito Takeda1, Takuma Arai1, Kohei Yamagami2, Le Duc Anh1,3, Masaaki Tanaka1,3,4, Masaki Kobayashi1,3, Shinobu Ohya1,3,4 (1.Dept of EEIS, The Univ. of Tokyo, 2.JASRI, 3.CSRN, The Univ. of Tokyo, 4.NanoQuine, The Univ. of Tokyo)


oxide,ferromagnet,synchrotron radiation spectroscopy

We have studied the mechanism of ferromagnetism enhancement in a La2/3Sr1/3MnO3 (LSMO) membrane released from a SrTiO3 (STO) substrate by using a water-dissolvable Sr4Al2O7 buffer layer. The LSMO membrane exceeds the as-grown LSMO film in the magnetic moment and Curie temperature. By resonant photoemission spectroscopy (RPES) on the as-grown film and membrane of LSMO, we elucidate that the strain release from the STO substrate enhances the itineracy of the Mn 3d electrons via the p-d hybridization. The enhancement of the itineracy strengthens the double-exchange interaction, improving the ferromagnetism of LSMO.